Implicit Kimi reasoning effort stopped; completion budget uses remaining context

What's Changed

• fix(kimi): use remaining context for completion budget by @RealKai42 in https://github.com/MoonshotAI/kimi-cli/pull/2494
• fix(kosong): preserve empty-string reasoning_content as ThinkPart by @bigeagle in https://github.com/MoonshotAI/kimi-cli/pull/2498
• fix(kosong): stop sending Kimi reasoning effort implicitly by @RealKai42 in https://github.com/MoonshotAI/kimi-cli/pull/2499
• feat(telemetry): align events with TS schema, add trace_id and missing events by @7Sageer in https://github.com/MoonshotAI/kimi-cli/pull/2500
• chore(release): bump kimi-cli to 1.49.0 and kosong to 0.55.0 by @sailist in https://github.com/MoonshotAI/kimi-cli/pull/2503

Full Changelog: https://github.com/MoonshotAI/kimi-cli/compare/1.48.0...1.49.0